Question

Which square numbers would have digits $6$ at units place?

• A. The root numbers will either have $4$ or $6$ in units place
• B. The root numbers will either have $1$ or $0$ in units place
• C. The root numbers will either have $6$ or $3$ in units place
• D. The root numbers will either have $9$ or $3$ in units place

Answer 1

Answer: (A)

The root numbers will either have $4$ or $6$ in units place

Only those numbers, when squared will have 6 at their unit place are the numbers ends with $4$ or $6$

Because $4\times 4$ $=$ $16$

and $6\times 6$ $=$ $36$

Hence, Option A is correct answer.